Photographic-printing device



May 28, 1929. w. T. FosTER PHOTOGRAPHAIC PRINTING DEVICE Filed March 17, 1927 @l N) 7 //////7//-w//7/////////////aA 7%/ ///////a/ .,ru. mk

Patented May 28, 1929.

l UNITED STATES PATENT OFFICE.

WILLIAM T. FOSTER, OF EASTON, PENNSYLVANIA, ASSIGNOR TO FISHER SCIENTIFIC COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

PHOTOGRAPHIC-PRINTING DEVICE.

Application led March 17, 1927. Serial No. 176,190.

' The present invent-ion relates to4 photographic printing appliances, and aims to provide a novel and improved photographic printing device adapted especially tor making photographic reproductions of bacterial colonies growing in culture mediums in Petri dishes, such as disclosed in my cepending application Serial No. 17 6,191 filed even date herewith, although the device may be used for making other photographic prints.-

Another object ot the invention is the provision of such a device embodying a holder for the sensitized card or sheet and Petri dish or other plate or sheet used as a negative, an electric lamp and means for concentrating the light rays on the Petri dish or negative. n

A further object is the provision of such a device having printingr and red electric lamps mounted in a novel manner so that either lamp may be conveniently removed, and the lamps used in various arrangements.

A still further obj ect of the invention is the provision ot a photographic printing device comprising a novel and convenient assembly ot the component elements.

lVit-h the foregoing and other objects in view, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as'hereinafter described and claimed, it being uuderstood that changes can be made within the scope ety what is claimed, without departing from the spirit of the invention.

rPhe invention is illustrated in the accompanying drawing, wherein` Figure 1 is a front elevation of the improved printing device.

Fig. 2 is a vertical section thereof on the line 2-2 et Fig. 1.

Fig. 3 is a vplan view of the holder for the sensitized card or sheet and the Petri dish or negative. Y v

A rectangular upright trame 7 is provided which is open at the front and also at the rear, although it may be closed at the rear if desired.

The holder tor the sensitized card or sheet and Petri dish or plate is disposed slidably on the bottom of the frame 7, and comprises a rectangular tray 8 slidable between the sides of the frame on the bottom thereof under cleats 9 carried by the sides of the frame to hold the tray on the bottom of said trame.

The card or sheet 10, which may be of the kind disclosed in said application Serial No. 176,191, is placed within the tray on the bottom thereof with its sensitized surface uppermost, and the Petri dish or plate 11 is placed in the tra-y over the card 10 and contains a tilm ot' cult-ure medium thereon in which are grown the bacterial colonies 19. ot a sample ot milk, water or other material used in bacterielogical investigation, although it will be understood that it the present device is used for oth-er photographic printing purposes, the Petri dish 11 may be substituted by the usual negative. A cover 13, which serves as a light shield also, is disposed within the tray, and is hinged,as at 14, to the rim ot the tray to swing upwardly for placing the card 10 and Petri dish 11 in and removing them Afrom the tray. rPhe cover 13 has a linger hold 15 which may be used for conveniently swinging said cover open, and the cover has an opening 1G through which the light may pass, said opening being of av size to provide the desired lield on the card 11 when the print is made. The tray may be readily slid from the trame 9 tor placing-the card 10 and Petri dish 11 in and removing them from the tray.

. The light'for rprinting is furnished by an electric lamp 17 which is engaged within and suspended from a lamp socket 18 secured to the lower surface of a. slide 19 disposed slidably between the sides of the frame orrcabinet 7. The sides et' the frame have plates 2O between which the slide 19 is movable, and said 'slide may be readily slid 'forwardly out ot the trame. Y

In order bo concentrate the light rays on the Petri dish 11 and card 10 through the opening 16, a cylinder' 21 surrounds the lamp 17 and is suspended t'rom hangers 22 secured to the lower surface of the slide 19. rThe upper and lower ends of the cylinder are open, and are spaced from the slide 19 and tray 8, respectively, for the upward flow of air through the cylinder to keep same cool and thereby avoid overheating, especially such as might be injurious to the bacterial growths on the Petri dish 11. The cylinder 21 is lo cated immediately above the opening 16 of the tray cover 13 so that the light rays from the lamp 17 are concentrated to the area bounded by the edge of the opening 16.

A double switch 23 of any suitable kin'd A Lio is carried by one side of the lrame7 at the exterior of the iframe, and wires24f extend from the socket 18 to the switch 23, for conncction with a source of electrical current (not shown), and the switch23 may be conveniently operated for rlighting Vand eXtinl guishing the lamp 17 Y Y p A small electric lamp 25 with a red bulb is disposed Y above the slidel 19, being secured within and suspended from a lamp socket 26 secured to thelowei' surface of an upper slide 27 that is movable under the top of the frame 7 in guide cleats 28 secured to said top of the frame. Flexible :wires 29 connect vthe socket 26 with the switch 23 so that the lamp 25 may be lighted and extinguished, the switch 23 f being adouble switch in order that each lamp may be controlled independently ot the other lainp.- r Y The electric lamps may be readily replaced by removing the slides 19 and 27 from the frame 7, and the printing lamp 17 may be of various candle powers. The removal of the slides containing the lamps is also of advantage for other purposes. Thus, the lamp 25 may be removed with the slide 27, and by inverting the lamp and slide the same may` be seated on top of the frame 7.0i1 at anyrother suitable point for convenience in placing the card 10 and Petri dish 111in'orremoving them from the tray when the tray has been removed lfrom the frame. Likewise,V the lamp 17 may be removed from the fraine'withl the slide 19. The lwires 24 and 29 are suiit,

, cient-ly longto permit the slides to be removed from the frame and seated on the surface on which the trame 7 rests.. It will also be noted frame 7 with the slide 27V place, the lamp 25 will en able-the tray to be positioned prop-Y erly in the frame, said tray being illuminated y by red light from above. Then, when the slide 19 is placedv backfin the rame'it obf structs .the light from theV lamp-25, although the light from said lampV may passent from betweenthe slide 19 and top of the frame. rlhe lamp 17 .is then lighted for the required period and 'time to complete the printing, after which the lamp 17 Y is extinguished and the tray-v8 removed.

i In order to provide foruniform light in-v tensity within the VopeningV '16, the bulb of the lamp 17 may be frosted or otherwise treat.-

ed so as to ditluse the light rays, or a frosted' glass'or other light diiuser 3() may beprovided inthe cylinder 21 below the lamp 17.

Havingl thus described is claimed as new is 1. An apparatus for making photographic the invention,lwhat prints directly from anrana'lyticalspecimen comprising a trame, anelectric lamp mounted in said frame, apprinting'tray slidably dis-V posed in said frame, and light concentrating means surrounding said lamp and projecting toward said tray, said trayhaving a sensitized-paper receiving base portion and a removably attached cover adapted to receive n and hold -a specimen in printing relation to the paper.V Y i Y Y 2. An apparatus for makingsphotographic prints comprising a iframe, an electric lamp mounted in said frame,a printing tray slidably disposed in said frame, and provided centrating cylinder open at both ends disposed about said lamp and directed toward saidopening 1 3. A deviceof the character described comprising a frame, a removable holder therein, a removable yslide inthe frame, an electric lamp carried by said slide, and means carried by said i slide VWithin and spaced from the frame and surrounding saidjlamp and projecting toward said holder to concentrate the light rays on an area of said holder.

4. A device of the character described com-A prising a'fraine, a holder mounted in vthe traine, a `red electric lamp mounted in said frame, a slide mounted removablyA in vthe prising a frame, avremovableholder therein,

frame between said'holdei and lamp, and a `iiirintirfg electric lamp carried by said slide between said slide and holder. j

6. A device ofthe-character described coinprising a frame, a holder therein, aremov able slide in the frame, a red electric lamp carried by .saidl slide, a second removable slide in the iframe between said lamp and holder, and al printing electric lamp Acarried Y by the second slide between said second slide and holder. i

l In testimony whereof I hereunto affix my signature.

WILLIAM T. Fosrnnl. 

